Want to know what that last Windows Phone 7 update included? Check the Update History!

Windows Phone update history

We think even great software can always get better. That’s why
we periodically release Windows Phone software updates to add new features
you’ve asked for and to maximize your phone’s performance.

Below is a summary of what we’ve included in each update so
far. The update number refers to the Windows Phone operating system (OS)
version. The updates are listed in reverse chronological order (the most recent
is listed first).

Because updates are cumulative, when you install the latest
update, you’ll also get all the previous updates if your phone doesn’t have them
already. Only updates that apply to your phone will be downloaded and installed.

When it’s available, we’ll also pass along software from phone
manufacturers that improves the performance of specific phone models. If you
have questions about what’s included in a phone manufacturer update, contact
your phone manufacturer.

To learn how to install updates, check if there’s an update
available for you to download, and determine which version of Windows Phone you
have now, see Phone updates FAQ.

History location: http://www.microsoft.com/windowsphone/en-us/howto/wp7/basics/update-history.aspx